The deal to purchase Arnold Lundgren Associates adds nine more staffers to Fehr Graham's Rockford office. Fehr Graham now has 24 people at its office in the newly renovated Prairie Street Brewhouse.

"It just made perfect sense to us for two established Rockford firms to come together to create one choice that provides significant expertise and great service," Mick Gonewold, Fehr Graham board chairman, said in a news release.

Fehr Graam does engineering and environmental work for commercial, industrial and government clients.

It's the second acquisition of the year for the company. In January, it announced it was acquiring an engineering and health/safety consulting firm in Plymouth, Wis. Fehr Graham now has 10 offices, five in Illinois, three in Iowa and two in Wisconsin.

Hoovers.com, a business research site, estimates Fehr Graham generates more than $9 million a year in revenue.